Chemical signatures in 635-million-year-old rock suggest our planet once had an otherworldly atmosphere that might have helped melt millions of years' worth of deep freeze.

Within the last decade, the Chubut province in Argentina has become a paradise for paleontologists seeking fossilized clues about the flora and fauna from millions of years hence.

Two 21-year-old climbers—including Rob Gauntlett, one of National Geographic Adventure magazine's 2008 adventurers of the year—died on the Alps' tallest mountain Saturday.

The far-ranging microbes may use the weather cycle to disperse themselves—an idea that "would have been viewed as crazy 25 years ago," researchers say.

What's in our drinking water?; Ancient brain found in cave; Record lightning in Brazil; and more.

First-ever footage released by a conservation group shows a rare Hispaniolan solenodon, one of the few living mammals that use venom.

Harvesting the biggest individuals causes a 300 percent faster evolution rate, leaving only smaller and younger animals to reproduce, a new study says.

Confiscated from a smuggler in Egypt, an ancient bronze statuette—perhaps of a goddess—has been returned to Iraq.

If a worker ant attempts to reproduce in the presence of the queen, the worker inadvertently produces a chemical that causes her sisters to attack.